Killing Child Process When Parent Crashes In Python

I am trying to write a python program to test a server written in C. The python program launches the compiled server using the subprocess module: pid = subprocess.Popen(args.server

Solution 1:

I would atexit.register a function to terminate the process:

importatexitprocess= subprocess.Popen(args.server_file_path)
atexit.register(process.terminate)
pid = process.pid

Or maybe:

import atexit
process = subprocess.Popen(args.server_file_path)
@atexit.registerdefkill_process():
    try:
        process.terminate()
    except OSError:
        pass#ignore the error.  The OSError doesn't seem to be documented(?)#as such, it *might* be better to process.poll() and check for #`None` (meaning the process is still running), but that #introduces a race condition.  I'm not sure which is better,#hopefully someone that knows more about this than I do can #comment.

pid = process.pid

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Note that this doesn't help you if you do something nasty to cause python to die in a non-graceful way (e.g. via os._exit or if you cause a SegmentationFault or BusError)